Beers Till Attractive. A rating system where a lower number is better. 0 is for someone that is attractive with no beers in you. And the higher the number, the more beers you would need to make the person seem attractive.

Dan: "BTA on that girl in the corner"
Kevin: "Gross man, that is like a BTA of 15"

B-T-A (bee-tee-eh): noun, a large breasted or busty asian. Not necessarily a female.
This acronym-turned-word stems from describing a large-breasted asian to my friend. I, one day, shortened it to BTA, meaning Big Titted Asian.